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datboi995
20.07.2019 •
Mathematics
Abc bookstore sells new books, n, for $12, and used books, u, for $8. the store earned $112 revenue last month. the store sold 4 more used books than new books. using the substitution method, how many new and old books did abc bookstore sell? a.n = 4; u = 8 b.n = 8; u = 4 c.n = 8; u = 12 d.n = 12; u = 8
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Ответ:
Revenue from new books = 12n
Revenue from old books = 8u
Last month, the store earned $112 as revenue, so we can write:
12n + 8u = 112
The store sold 4 more used books than new books, so we can write:
u = n + 4
Using the value of u, in above equation, we get:
12n + 8(n+4) = 112
12n +8n + 32 = 112
20n= 80
⇒
n=4
Since,
u = n + 4
u = 4 + 4 = 8
Thus, the store sold 4 new books and 8 old books last month. So the correct option is A
Ответ:
39+17+90+x=180
146+x=180
x=180-146
x=34
i think this is the answer chief